Abstract
Dichroic Nd 3+:Au–antimony glass (K 2O–B 2O 3–Sb 2O 3) nanocomposites (NCs) have been synthesized by single-step melt-quench thermochemical reduction process. The UV–Vis–NIR spectra show surface plasmon resonance (SPR) band of Au 0 nanoparticles (NPs) and absorption peaks of Nd 3+ ions. XRD and SAED results indicate growth of Au 0 NPs along (200) plane. TEM image reveals elliptical Au 0 NPs having sizes 12–21 nm (aspect ratio ∼1.2) responsible for the dichroic behavior. Photoluminescent upconversion under excitation at 805 nm exhibit two emission bands of Nd 3+ ions at 540 (green) and 650 (red) nm due to 4G 7/2 → 4I 9/2 and 4G 7/2 → 4I 13/2 transitions respectively. Both bands undergo maximum 8 and 11 fold intensity enhancements respectively at 0.03 wt% Au 0 (4.1 × 10 18 atoms/cm 3). Local field enhancement (LFE) induced by Au 0 SPR and energy transfer (ET) from Au 0 → Nd 3+ is found to be responsible for enhancement while ET from Nd 3+ → Au 0 and optical re-absorption due to Au 0 SPR for quenching.
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